Distinguishing between buried semiconductor/metal contacts and hybrid semiconductor/metal/liquid contacts at n-GaAs/KOH-Se-/2-(aq) junctions

Ashish Bansal, Ming X. Tan, Bruce J. Tufts, Nathan S Lewis

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The current-voltage properties of n-GaAs photoanodes have been evaluated in KOH-Se-/2-(aq), CH3CN-Fc+/0, and CH3CN-MV2+/+ solutions. Chemisorption of transition-metal ions (RhIII, CoIII, RuIII, OsIII) onto n-GaAs has been shown previously to effect improved photoanode behavior for n-GaAs/KOH-Se-/2-(aq) contacts, but it is not clear whether the chemisorbed metal forms a buried semiconductor/metal junction or results in a hybrid semiconductor/metal/liquid contact. After chemisorption of transition-metal ions, n-GaAs photoanodes displayed different open circuit voltages in contact with each electrolyte solution investigated. The role of the chemisorbed metal in the n-GaAs/M/KOH-Se-/2-(aq) system is, therefore, best described as catalyzing interfacial charge transfer at the semiconductor/liquid interface, as opposed to establishing a semiconductor/metal or semiconductor/ insulator/metal contact that is exposed to, but not influenced by, the electrolyte solution.

Original languageEnglish
Pages (from-to)7309-7315
Number of pages7
JournalJournal of Physical Chemistry
Volume97
Issue number28
Publication statusPublished - 1993

Fingerprint

liquid metals
Liquid metals
Contacts (fluid mechanics)
electric contacts
Metals
Semiconductor materials
metals
chemisorption
metal ions
Chemisorption
transition metals
Electrolytes
electrolytes
Transition metals
Metal ions
MIS (semiconductors)
open circuit voltage
Open circuit voltage
charge transfer
Charge transfer

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Distinguishing between buried semiconductor/metal contacts and hybrid semiconductor/metal/liquid contacts at n-GaAs/KOH-Se-/2-(aq) junctions. / Bansal, Ashish; Tan, Ming X.; Tufts, Bruce J.; Lewis, Nathan S.

In: Journal of Physical Chemistry, Vol. 97, No. 28, 1993, p. 7309-7315.

Research output: Contribution to journalArticle

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N2 - The current-voltage properties of n-GaAs photoanodes have been evaluated in KOH-Se-/2-(aq), CH3CN-Fc+/0, and CH3CN-MV2+/+ solutions. Chemisorption of transition-metal ions (RhIII, CoIII, RuIII, OsIII) onto n-GaAs has been shown previously to effect improved photoanode behavior for n-GaAs/KOH-Se-/2-(aq) contacts, but it is not clear whether the chemisorbed metal forms a buried semiconductor/metal junction or results in a hybrid semiconductor/metal/liquid contact. After chemisorption of transition-metal ions, n-GaAs photoanodes displayed different open circuit voltages in contact with each electrolyte solution investigated. The role of the chemisorbed metal in the n-GaAs/M/KOH-Se-/2-(aq) system is, therefore, best described as catalyzing interfacial charge transfer at the semiconductor/liquid interface, as opposed to establishing a semiconductor/metal or semiconductor/ insulator/metal contact that is exposed to, but not influenced by, the electrolyte solution.

AB - The current-voltage properties of n-GaAs photoanodes have been evaluated in KOH-Se-/2-(aq), CH3CN-Fc+/0, and CH3CN-MV2+/+ solutions. Chemisorption of transition-metal ions (RhIII, CoIII, RuIII, OsIII) onto n-GaAs has been shown previously to effect improved photoanode behavior for n-GaAs/KOH-Se-/2-(aq) contacts, but it is not clear whether the chemisorbed metal forms a buried semiconductor/metal junction or results in a hybrid semiconductor/metal/liquid contact. After chemisorption of transition-metal ions, n-GaAs photoanodes displayed different open circuit voltages in contact with each electrolyte solution investigated. The role of the chemisorbed metal in the n-GaAs/M/KOH-Se-/2-(aq) system is, therefore, best described as catalyzing interfacial charge transfer at the semiconductor/liquid interface, as opposed to establishing a semiconductor/metal or semiconductor/ insulator/metal contact that is exposed to, but not influenced by, the electrolyte solution.

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